InteropGrabBag in LibreOffice Writer

What it is, how to use it and what uses it already.

LibreOffice Writer's ODF filter was always capable of remembering attributes of elements which it does not understand, so after a load and save, such attributes were not lost. But what about the rest of the file formats? InteropGrabBag is a new API we have been creating over the past few months that lets foreign filters store their unhandled attributes, so such information is not lost during such a round trip. Come and see where we are, what still needs to be done, and how you can help.